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A researcher discovered that people who have low levels of immune-system activity tend to score much lower on tests of mental health than do people with normal or high immune-system activity. The researcher concluded from this experiment that the immune system protects against mental illness as well as against physical disease.

The researcher’s conclusion depends on which of the following assumptions?

Re: QOTD: A researcher discovered that people who have low levels [#permalink]

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27 Dec 2017, 17:20

Went with D

low levels of immune-system-- lower on tests of mental health than do people with normal or high immune-system activity.Conclusion -- the immune system protects against mental illness as well as against physical disease.

So, the author have to take into consideration option D before he makes this a conclusion.

Re: QOTD: A researcher discovered that people who have low levels [#permalink]

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27 Dec 2017, 22:19

A researcher discovered that people who have low levels of immune-system activity tend to score much lower on tests of mental health than do people with normal or high immune-system activity. The researcher concluded from this experiment that the immune system protects against mental illness as well as against physical disease.

The researcher’s conclusion depends on which of the following assumptions?Premise:Cause: good immune system Effect: good Mental illness Assumption:The effect is not the cause [Reverse is not true]

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Premise mentions physical diseases only in last sentence : " The researcher concluded from this experiment that the immune system protects against as well as against physical disease."= Immune systems protects against physical diseases= Immune systems protects against mental illness

B: X is similar to Y in its effects on body systems.Does the premise mention how physical diseases affect immune system or can you infer this from the premise?I don't think so. Then how can you say X is similar to Y in the way Y affects the body systems(e.g immune system), when the premise does NOT address how Y affects the body systems at the first place? In B, X is referring to Y in its behavior, whereas Y's behavior itself is not discussed at all.

Hope you got the bottom line.
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Premise mentions physical diseases only in last sentence : " The researcher concluded from this experiment that the immune system protects against as well as against physical disease."= Immune systems protects against physical diseases= Immune systems protects against mental illness

B: X is similar to Y in its effects on body systems.Does the premise mention how physical diseases affect immune system or can you infer this from the premise?I don't think so. Then how can you say X is similar to Y in the way Y affects the body systems(e.g immune system), when the premise does NOT address how Y affects the body systems at the first place? In B, X is referring to Y in its behavior, whereas Y's behavior itself is not discussed at all.

Hope you got the bottom line.

It's a technical/geometrical question, look at the Vienna diagrams applied to this question.

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There's an unusual twist in the stated conclusion here that's definitely worth noticing.This is the stated conclusion:The researcher concluded from this experiment that the immune system protects against mental illness as well as against physical disease.

AT FIRST this conclusion may seem to have two parts:• The immune system protects against mental illness.• The immune system protects against physical disease.

A look over the argument, though, reveals that there are NO premises related to physical disease. Therefore, the ACTUAL conclusion SUPPORTED by this argument is"the immune system protects against mental illness".

The second part — about physical disease — is just a piece of universal everyday knowledge. It is NOT supported by the argument, and so, therefore, it is NOT part of the argument's conclusion.

I haven't seen too many concluding statements structured like this — but it's worth noting that they exist, both on GMAT CR and in real life.
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I haven't seen too many concluding statements structured like this — but it's worth noting that they exist, both on GMAT CR and in real life.

As an example of the latter ("in real life")—

Imagine that a website or magazine carries a recipe for a vegetable dish, describing the dish as "delicious as well as nutritious!"

This statement won't be the conclusion of an argument — i.e., it's VERY unlikely that any premises would be given to support these statements; like other statements of opinion, they would just be declared — but its two parts work like those of the sentence discussed here:• "Delicious" is the ACTUAL POINT of the sentence;• "Nutritious" is just something most people already accept and believe about vegetable dishes in general (and is mentioned, presumably, because readers might find it surprising that a "nutritious" dish could also be "delicious!").
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